package com.atguigu.gulimall.auth.controller;

import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.constant.AuthServerConstant;
import com.atguigu.common.exception.BizCodeEnum;
import com.atguigu.common.utils.R;
import com.atguigu.common.vo.MemberRespVo;
import com.atguigu.gulimall.auth.feign.MemberFeignService;
import com.atguigu.gulimall.auth.feign.ThirdPartyFeignService;
import com.atguigu.gulimall.auth.vo.UserLoginVo;
import com.atguigu.gulimall.auth.vo.UserRegistVo;
import org.apache.commons.lang.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.validation.BindingResult;
import org.springframework.validation.FieldError;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.mvc.support.RedirectAttributes;

import javax.servlet.http.HttpSession;
import javax.validation.Valid;
import java.util.HashMap;
import java.util.Map;
import java.util.UUID;
import java.util.concurrent.TimeUnit;
import java.util.stream.Collectors;
//普通用户登录服务
@Controller
public class LoginController {

    @Autowired
    ThirdPartyFeignService thirdPartyFeignService;

    @Autowired
    StringRedisTemplate redisTemplate;

    @Autowired
    MemberFeignService memberFeignService;
    /**
     * 发送一个请求，直接跳转到一个页面
     * SpringMvc viewController 将请求和页面映射过来
     * @return
     */

    /**
     * 发送手机验证码服务
     * @param phone
     * @return
     */
    @ResponseBody
    @GetMapping("/sms/sendcode")
    public R senCode(@RequestParam("phone") String phone){

        //TODO  1.接口防刷 防止恶意刷验证码

        String redisCode = redisTemplate.opsForValue().get(AuthServerConstant.SMS_CODE_CACHE_PREFIX + phone);
        if(!StringUtils.isEmpty(redisCode)){
            long l = Long.parseLong(redisCode.split("_")[1]);
            if(System.currentTimeMillis() - l < 60000){
                // 60秒内，用户不能再次发送验证码请求
                return R.error(BizCodeEnum.SMS_CODE_EXCEPTION.getCode(),BizCodeEnum.SMS_CODE_EXCEPTION.getMsg());
            }
        }

        // 2.验证码的再次校验 redis：存key-phone   value-code sms:code:18634585136 -> 456776
        String code = UUID.randomUUID().toString().substring(0, 5);
        System.out.println("验证码:" +code);
        String RedisCode = code +"_" +System.currentTimeMillis();

        //redis缓存验证码，防止同一个phone在60s内再次发送验证码
        redisTemplate.opsForValue().set(AuthServerConstant.SMS_CODE_CACHE_PREFIX+phone,
                RedisCode,10, TimeUnit.MINUTES);
        thirdPartyFeignService.sendCode(phone,code);
        return R.ok();
    }


    /**
     *注册服务
     *    RedirectAttributes:模拟重定向携带数据
     *    TODO 重定向携带数据，利用session原理，将数据放在session中，
     *    TODO 只要跳到下一个页面去除这个数据以后，session里面的数据就会删掉
     *
     *    TODO 解决分布式下的session问题
     * @param vo
     * @param result
     * @param redirectAttributes
     * @return
     */
    @PostMapping("/regist")
    public String regist(@Valid UserRegistVo vo, BindingResult result,
                         RedirectAttributes redirectAttributes){
        if(result.hasErrors()){

            Map<String, String> errors = result.getFieldErrors().stream().collect(
                    Collectors.toMap(FieldError::getField, FieldError::getDefaultMessage));
//            model.addAttribute("errors",errors);
            redirectAttributes.addFlashAttribute("errors",errors);

            //校验出错，转发到注册页面
            //     错误处理：       Request method 'POST' not supported
            //            用户注册--> regist[post] ---> 转发/reg.html(路径映射默认都是get方式访问的)
            //重定向到注册页，防止表单重复提交  转发地址不变，会导致表单重复提交的问题
            return "redirect:http://auth.gulimall.com/reg.html";
        }

        // 1.校验验证码
        String code = vo.getCode();
        String s = redisTemplate.opsForValue().get(AuthServerConstant.SMS_CODE_CACHE_PREFIX + vo.getPhone());
        if(!StringUtils.isEmpty(s)){
            if(code.equals(s.split("_")[0])){
                //删除验证码  令牌机制
                redisTemplate.delete(AuthServerConstant.SMS_CODE_CACHE_PREFIX + vo.getPhone());
                //验证码通过 真正注册，调用远程服务进行注册
                R r = memberFeignService.regist(vo);
                if(r.getCode() == 0){
                    //注册成功,跳转到登录页
                    return "redirect:http://auth.gulimall.com/login.html";
                }else{
                    Map<String,String> errors = new HashMap<>();
                    errors.put("msg",r.getData("msg",new TypeReference<String>(){}));
                    redirectAttributes.addFlashAttribute("errors",errors);
                    return "redirect:http://auth.gulimall.com/reg.html";
                }
            }else{
                Map<String,String> errors = new HashMap<>();
                errors.put("code","验证码错误");
                redirectAttributes.addFlashAttribute("errors",errors);
                return "redirect:http://auth.gulimall.com/reg.html";
            }
        }else{
            Map<String,String> errors = new HashMap<>();
            errors.put("code","验证码错误");
            redirectAttributes.addFlashAttribute("errors",errors);
            return "redirect:http://auth.gulimall.com/reg.html";
        }
    }

    /**
     * 登录页请求处理，已经登录的用户就不用再登录了，访问登录页将直接跳转到首页
     * @param session
     * @return
     */
    @GetMapping("/login.html")
    public String loginPage(HttpSession session){
        Object attribute = session.getAttribute(AuthServerConstant.LOGIN_USER);
        if(attribute ==null){
            //没登录，没有存储session数据
            return "login";
        }else{
            //已经登录，存储session数据 重定向到首页
            return "redirect:http://gulimall.com";
        }
    }

    /**
     * 登录服务
     * @param vo
     * @param redirectAttributes
     * @return
     */
    @PostMapping("/login")
    public String login(UserLoginVo vo, RedirectAttributes redirectAttributes,
                        HttpSession session){

        //远程登录
        R login = memberFeignService.login(vo);
        if(login.getCode() == 0){
            //成功
            MemberRespVo data = login.getData("data", new TypeReference<MemberRespVo>() {});
            //登录成功，将用户信息放到 session中
            session.setAttribute(AuthServerConstant.LOGIN_USER,data);

            return "redirect:http://gulimall.com";
        }else{
            Map<String,String> errors = new HashMap<>();
            errors.put("msg",login.getData("msg",new TypeReference<String>(){}));
            redirectAttributes.addFlashAttribute("errors",errors);
            return "redirect:http://auth.gulimall.com/login.html";
        }
    }
}
